complicated microscopic operation lasted 5 hours 

Riyadh:  ENT doctors in Jazan (southern Saudi Arabia) performed a 5-hour complicated operation to repair the skull base of a male patient. 
Saudi Health said that on Monday 12th September, ENT specialists at King Fahad Central Hospital managed to repair the skull base, brain meninges, and ear tissues of a patient who suffered from severe corrosion from the vestibular and semicircular canals down to the cochlear.
The medical team utilized a microscope and neuronavigational tool to repair the skull base through the ear opening, as well as repair inner ear bones. 
Post-surgery, the patient was moved to the ICU for follow-up by the doctors and nursing team until fully recovered.